Jumbo-D O2 cylinder EMS with rethreaded scuba valve

Joe Botz · 18th September 2007, 04:01

Do you think that rethreading a scuba cyl. valve to fit a jumbo-d medical o2 cyl. would work? Said cylinder holds 17cu in. @ 2215 5.3 inch dia., 13.3 inches long.

**Dave Sutton** · 19th September 2007, 00:58

It's been done, but the issue is holding the valve in a lathe chuck... they are irregularly shaped and are almost impossiblr to true-up, even with a 4 jaw chuck and best efforts. Easier to just get a proper cylinder.

Dave

Deepthought_reloaded · 19th September 2007, 03:10

I presume you're asking the question because you already have said Cylinder?

If not forget it - Buy the proper thing...

BUT if so, there are a few places that sell valves - I think I saw some DIN valves in small taper at underwater france

Robinet DIN petit cône - Robinets - Robinetterie et accessoires

Or are you thinking the modern Aluminium ones with parallel threads?

Andy

Joe Botz · 19th September 2007, 03:27

yep have a couple, thanks for the input and info. Not all ems o2 cylinders have a tapered thread.

Stephane · 19th September 2007, 07:51

Quote: (Originally Posted by Deepthought_reloaded)

I presume you're asking the question because you already have said Cylinder?

If not forget it - Buy the proper thing...

BUT if so, there are a few places that sell valves - I think I saw some DIN valves in small taper at underwater france

Robinet DIN petit cône - Robinets - Robinetterie et accessoires

Or are you thinking the modern Aluminium ones with parallel threads?

Andy

Hello,

Such valves can be easily found on Ebay.de for almost nothing. Look for kk valves or klein konisch.
Or just ring Martin at tecme.de, I'm sure he has new valves to sell for a better price than Underwater France.

**Dave Sutton** · 19th September 2007, 10:13

Since he's in New York, I am *certain* that he has a parallel thread, 5/8 inch, O-Ring sealed cylinder.

The USA abandoned tapered threads in these cylinders 20+ years ago, and even then it was 1/2 NPT, not Kleinkonish as is used in Europe.

The only SCUBA valves I have ever seen in 5/8 straight thread were on the Feino, because they purchased Luxfer medical cylinders for the rigs.

Dave

DanFountain · 19th September 2007, 10:59

The thread on modern US aluminum medical O2 bottles is 0.750-16 UNF-2B, standard 3/4 fine thread like a bolt. There are a few scuba valves in this thread out there - older steel Survivair escape bottles use this thread, but the bottles make such nice argon bottles (and homebuilt rebreather bottles!) that it's a shame to rob the valves. If I'm not mistaken there were some steel 72 cf scuba tanks years ago that used this thread - White Stag maybe? - so there are some J (and maybe K) valves floating around out there in the used gear market. Standard pin-indexed O2 valves (I can't remember the CGA number) can be re-machined to scuba inlet profile (also has a CGA name / number - breathing air for human consumption or some such) by anybody who happens to have a CNC mill. Still not much good, since most O2 valves don't have a knob, except the ones from Biomarine such as on the composite O2 cylinder on the BP-240.
Bottom line - it's a lot easier to use a scuba bottle.

-Dan

**Dave Sutton** · 20th September 2007, 02:49

Or to contact Joel at TDL who has 'em in stock...

Dave

DanFountain · 21st September 2007, 10:53

Quote: (Originally Posted by Dave Sutton)

Or to contact Joel at TDL who has 'em in stock...

I tried to look at Joel's site to see what he's got in stock - scuba tanks or oddball valves? - but the site seems to be down. Anybody know what's up with TDL?
-Dan

cramerdn · 21st September 2007, 14:47

Quote: (Originally Posted by DanFountain)

I tried to look at Joel's site to see what he's got in stock - scuba tanks or oddball valves? - but the site seems to be down. Anybody know what's up with TDL?
-Dan

Opens fine for me.

18th September 2007, 04:01	#1 (permalink)
Joe Botz New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Aug 2005 Location: USA, NY Posts: 41	Jumbo-D O2 cylinder EMS with rethreaded scuba valve Do you think that rethreading a scuba cyl. valve to fit a jumbo-d medical o2 cyl. would work? Said cylinder holds 17cu in. @ 2215 5.3 inch dia., 13.3 inches long.
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19th September 2007, 00:58	#2 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve It's been done, but the issue is holding the valve in a lathe chuck... they are irregularly shaped and are almost impossiblr to true-up, even with a 4 jaw chuck and best efforts. Easier to just get a proper cylinder. Dave __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com
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19th September 2007, 03:10	#3 (permalink)
Deepthought_reloaded New Member Current Rebreather/s: Azimuth Other Rebreather/s: Azimuth Join Date: Oct 2006 Location: York Posts: 59	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve I presume you're asking the question because you already have said Cylinder? If not forget it - Buy the proper thing... BUT if so, there are a few places that sell valves - I think I saw some DIN valves in small taper at underwater france Robinet DIN petit cône - Robinets - Robinetterie et accessoires Or are you thinking the modern Aluminium ones with parallel threads? Andy __________________ Dolphins... On Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much; the wheel, New York, Industry and so on while all the dolphins had ever done was muck about in the water having a good time. Conversely, the dolphins had always believed that they were far more intelligent than man; for precisely the same reasons. Douglas Adams - Hitchhikers Guide to the Galaxy
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19th September 2007, 03:27	#4 (permalink)
Joe Botz New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Aug 2005 Location: USA, NY Posts: 41	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve yep have a couple, thanks for the input and info. Not all ems o2 cylinders have a tapered thread. Last edited by Joe Botz : 19th September 2007 at 03:33.
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19th September 2007, 07:51	#5 (permalink)
Stephane Stéphane Acounis Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 769	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve Quote: (Originally Posted by Deepthought_reloaded) I presume you're asking the question because you already have said Cylinder? If not forget it - Buy the proper thing... BUT if so, there are a few places that sell valves - I think I saw some DIN valves in small taper at underwater france Robinet DIN petit cône - Robinets - Robinetterie et accessoires Or are you thinking the modern Aluminium ones with parallel threads? Andy Hello, Such valves can be easily found on Ebay.de for almost nothing. Look for kk valves or klein konisch. Or just ring Martin at tecme.de, I'm sure he has new valves to sell for a better price than Underwater France. __________________ Stéphane
(Online)

19th September 2007, 10:13	#6 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve Since he's in New York, I am certain that he has a parallel thread, 5/8 inch, O-Ring sealed cylinder. The USA abandoned tapered threads in these cylinders 20+ years ago, and even then it was 1/2 NPT, not Kleinkonish as is used in Europe. The only SCUBA valves I have ever seen in 5/8 straight thread were on the Feino, because they purchased Luxfer medical cylinders for the rigs. Dave __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com
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19th September 2007, 10:59	#7 (permalink)
DanFountain This is my custom title! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2005 Location: Lake Superior Posts: 103	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve The thread on modern US aluminum medical O2 bottles is 0.750-16 UNF-2B, standard 3/4 fine thread like a bolt. There are a few scuba valves in this thread out there - older steel Survivair escape bottles use this thread, but the bottles make such nice argon bottles (and homebuilt rebreather bottles!) that it's a shame to rob the valves. If I'm not mistaken there were some steel 72 cf scuba tanks years ago that used this thread - White Stag maybe? - so there are some J (and maybe K) valves floating around out there in the used gear market. Standard pin-indexed O2 valves (I can't remember the CGA number) can be re-machined to scuba inlet profile (also has a CGA name / number - breathing air for human consumption or some such) by anybody who happens to have a CNC mill. Still not much good, since most O2 valves don't have a knob, except the ones from Biomarine such as on the composite O2 cylinder on the BP-240. Bottom line - it's a lot easier to use a scuba bottle. -Dan __________________ Try not. Do - or do not. There is no try. -Yoda
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20th September 2007, 02:49	#8 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve Or to contact Joel at TDL who has 'em in stock... Dave __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com
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21st September 2007, 10:53	#9 (permalink)
DanFountain This is my custom title! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2005 Location: Lake Superior Posts: 103	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve Quote: (Originally Posted by Dave Sutton) Or to contact Joel at TDL who has 'em in stock... I tried to look at Joel's site to see what he's got in stock - scuba tanks or oddball valves? - but the site seems to be down. Anybody know what's up with TDL? -Dan __________________ Try not. Do - or do not. There is no try. -Yoda
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21st September 2007, 14:47	#10 (permalink)
cramerdn Obey my dog! Current Rebreather/s: Evolution Dolphin Other Rebreather/s: Dolphin Join Date: Dec 2006 Location: Townsville QLD Posts: 626	Re: Jumbo-D O2 cylinder EMS with rethreaded scuba valve Quote: (Originally Posted by DanFountain) I tried to look at Joel's site to see what he's got in stock - scuba tanks or oddball valves? - but the site seems to be down. Anybody know what's up with TDL? -Dan Opens fine for me. __________________ "Its better to live one day as a tiger than an entire life as a worm." "But who's ever heard of a worm skin rug?"
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